Dear Stanislas and Sue, and others,
Sure Stanislas, nothing wrong with you, but there are several problems
with the Synopsis 32 and other reference works as well. I've been
struggling with Nothria species in the North Atlantic for some time and
they are regrettably rather confused. The good message is that there are
presumably not so many species around in the area, the bad message is that
the use of names is rather mixed-up and several of the important taxonomic
characters are incorrectly described in standard identification
literature. You may have some help from Kristian Fauchald's revision, but
he also made some mistakes with respect to the characters of taxonomic
importance and his key to Nothria does not work well. Further, Nothria was
redefined by Hannelore Paxton in her revision of Onuphids in 1986 (Records
Australian Museum 38) and now also includes a couple of species referred
to other genera by Fauchald (1982).
The description of N. conchylega in the Synopsis is incorrect with regard
to the bristles on the most anterior chaetigers. N. conchylega has
chaetiger 1 with very stout unidentate or slightly bidentate hooks, and
chaetiger 2 and 3 with unidentate or bidentate hooks, capillary chaetae
and pectinate chaetae. A similar distribution of chaetae is found in
Nothria britannica, which is considered as a valid species by Fauchald,
but the relationship between these two is unclear. Hannelore gives some
good figures of N. conchylega in her revision.
The important character to observe is the chaetae on chaetiger 2 because
there is at least one, possibly more, species in European waters with only
hooks on both chaetiger 1 and 2 (no capillaries and no pectinate chaetae).
In these species the hooks are bidentate. To my knowledge there are three
described species with this characteristic in the North Atlantic: Nothria
hyperborea (Hansen, 1878) from the Norwegian shelf, Nothria africana
(Augener, 1918) from north African waters, and Nothria atlantica (Hartman,
1965) from the Mid-Atlantic ridge. The relationships between these species
are unclear. Fauchald (1982) redescribed N. hyperborea, but based the
species diagnosis on characters which later has been shown to be variable
and without taxonomic value (Jirkov & Yermolaev 1989; in Russian). Jirkov
in his Russian book (2002) uses the name N. africana for the species in
shelf waters. In the same book, however, N. hyperborea is used for what we
name as N. conchylega (puh !)
Well, enough about the problems. I am presently working on a guide to
onuphids in the North East Atlantic which I hope to complete this autumn.
Regarding Nothria I hope to clear things up a bit, but I am afraid that we
at some stage need to start from the beginning and redescribe the species
from type material and topotypes to get things clear. I could send you a
provisional version of the guide.
Greetings,
Eivind
----------------------------------------------------------------------------------------------------------------------
Norwegian Institute Name : Eivind Oug
for Water Research (NIVA) E-mail : eivind.oug from niva.no
Branch Office South Phone : + 47 98 22 77 80
Televeien 3 Fax : + 47 37 04 45 13
N-4879 Grimstad Norway Internet : http://www.niva.no
From:
"Sue Hamilton" <sue.hamilton from blueyonder.co.uk>
To:
"Stanislas DUBOIS" <Stanislas.Dubois from ifremer.fr>,
<annelida from magpie.bio.indiana.edu>
Date:
04.10.2010 11:33
Subject:
Re: [Annelida] Eunicida: Nothria conchylega ?
Sent by:
annelida-bounces from oat.bio.indiana.edu
Hello Stanislas
Nothing wrong with you - Yes, the Synopsis has a very limited number of
species to choose from. Try to get a copy of 'Revision of Onuphis,
Nothria
and Paradiopatra (Polychaeta: Onuphidae) Based on Type Material' by
Kristian Fauchald, Smithsonian Contributions to Zoology No. 356,
Smithsonian
Institution Press 1982. 1-109. for a much wider selection. Maybe someone
has a pdf they could provide - I only have a photocopy.
Cheers, Sue
Sue Hamilton, BSc (Hons), CBiol, MSB
Marine Biologist
22 Bryce Crescent, Currie
Midlothian EH14 5LL
Scotland, UK
Tel. +44 (0) 131 449 6209
sue.hamilton from blueyonder.co.uk
----- Original Message -----
From: "Stanislas DUBOIS" <Stanislas.Dubois from ifremer.fr>
To: <annelida from magpie.bio.indiana.edu>
Sent: Monday, October 04, 2010 9:07 AM
Subject: [Annelida] Eunicida: Nothria conchylega ?
> Hi polychaete lovers,
>> I'm currently fighting with a few individuals from the same species very
> likely from the genus Nothria (Malmgren, 1866) but base on the keys I'm
> using (i.e. Synopsis of the British Fauna n°32, Eunicida), I can't come
up
> with something satisfacory. Everything match with Nothria conchylega
> (Sars, 1835) except the stout hooked chaeta from chaetiger 1 & 2 that
are
> missing and the occurrence of clearly bidendate hooked chaeta instead.
> Speciment have been collected in South Brittany, France and I do have
> "true" specimen of Nothria conchylega (Sars, 1835) from that region with
> the stout hooked chaeta from chaetiger 1 & 2.
>> So, what is wrong with me? Does anyone have a better key with a better
> description of this genus to provide? Have anyone face this problem
yet?
>> Thanks for your help,
>> Stan.
> --
> ______________________________________________________
>> Stanislas DUBOIS (PhD)
> Laboratoire DYNECO / Ecologie Benthique
> IFREMER - French Research Institute for Exploitation of the Sea
> Technopole de Brest-Iroise
> B.P. 70 - 29280 Plouzané - FRANCE
> Tel: (33) +2 98 22 49 18
> Mob: (33) +6 83 07 70 28
> Fax: (33) +2 98 22 45 48
> email: sdubois from ifremer.fr>>> _______________________________________________
> Annelida mailing list
> Post: Annelida from net.bio.net> Help/archive: http://www.bio.net/biomail/listinfo/annelida> Resources: http://www.annelida.net
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